feat(km): add full corpus asset taxonomy readback

apps/api/src/services/knowledge_service.py

@@ -21,6 +21,7 @@ from src.models.knowledge import (
     CategoryCount,
     EntryStatus,
     EntryType,
+    KnowledgeAssetTaxonomyCount,
     KnowledgeEntry,
     KnowledgeEntryCreate,
     KnowledgeEntryUpdate,
@@ -49,6 +50,8 @@ _DEGRADED_CATEGORY_FALLBACKS = (
     "general",
 )
 
+_ASSET_TAXONOMY_FALLBACKS = _DEGRADED_CATEGORY_FALLBACKS[:-1]
+
 # =============================================================================
 # Singleton
 # =============================================================================
@@ -65,6 +68,10 @@ def build_knowledge_list_readback_degraded_response(reason: str) -> KnowledgeLis
             CategoryCount(category=category, count=0)
             for category in _DEGRADED_CATEGORY_FALLBACKS
         ],
+        asset_taxonomy=[
+            KnowledgeAssetTaxonomyCount(key=key, count=0)
+            for key in _ASSET_TAXONOMY_FALLBACKS
+        ],
         readback_status="degraded",
         operator_stage="knowledge_readback_degraded_ai_controlled_repair",
         next_step=(
@@ -191,8 +198,16 @@ class KnowledgeService:
                 categories = [
                     CategoryCount(category=cat, count=cnt) for cat, cnt in categories_raw
                 ]
+                asset_taxonomy_raw = await repo.get_asset_taxonomy_counts()
+                asset_taxonomy = [
+                    KnowledgeAssetTaxonomyCount(key=key, count=count)
+                    for key, count in asset_taxonomy_raw
+                ]
                 return KnowledgeListResponse(
-                    items=items, total=total, categories=categories
+                    items=items,
+                    total=total,
+                    categories=categories,
+                    asset_taxonomy=asset_taxonomy,
                 )
         except Exception as exc:  # noqa: BLE001 - production readback must fail soft
             logger.warning(
@@ -207,6 +222,23 @@ class KnowledgeService:
             )
             return build_knowledge_list_readback_degraded_response(str(exc))
 
+    async def get_asset_taxonomy(self) -> list[KnowledgeAssetTaxonomyCount]:
+        """取得 AI 自動化資產維度統計。"""
+        try:
+            async with get_db_context() as db:
+                repo: IKnowledgeRepository = KnowledgeDBRepository(db)
+                rows = await repo.get_asset_taxonomy_counts()
+                return [
+                    KnowledgeAssetTaxonomyCount(key=key, count=count)
+                    for key, count in rows
+                ]
+        except Exception as exc:  # noqa: BLE001 - taxonomy must not 500 the KM UI
+            logger.warning("knowledge_asset_taxonomy_readback_degraded", error=str(exc))
+            return [
+                KnowledgeAssetTaxonomyCount(key=key, count=0)
+                for key in _ASSET_TAXONOMY_FALLBACKS
+            ]
+
     async def get_categories(self) -> list[CategoryCount]:
         """取得分類統計（直接呼叫 repo，不走 list_entries）"""
         try: